HI.
The error "unknown downlink protocol" is not very important, it's just a warning. It's each hour when chilli call the radiusconfig function. I need to find a way to stop it, but the problem dosn't come from here.
As for Crazybob, please, check if the DNS is working on your clients, if not, try to change the two dns (dns1 and dns2 key in the db) to those of your ISP.
Or easier, you can just try to enter an IP address in the browser of your client (even a fake one,
http://11.12.13.14/ or anything). If this test works (you see the login page), the issue is dns related (it's often the case)